Questions on Algebra: Systems of Linear Equations answered by real tutors!

Tutors Answer Your Questions about Linear-systems (FREE)

Question 199464: The question is asking to solve each system by any method, if possible. If a system is inconsistent or if the equations are dependant, state this. Can you please help me solve # 39 in study set 3.2 under try it yourself.
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Question 199578: Solve the sytem of equations by graphing. Then classify the system.
x+y=15
x-y=3
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Question 199621: The difference between two numbers is 18. If the larger number is 5 more than twice the smaller number, what is their sum?
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Question 199704: I need to graph the following:
y=-1/2x+3 and y=3/2x-1
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Question 199718: x+0, times y=3
show graph
is there an x-intercept? is there an y intercept? if so what is it?
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Question 199716: y=7/5x-3
solve for x
find x, and y intercept
find slope
find ordered pairs to graph
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Question 199681: i need to solve this using the substitution method
8x+2y-7=0
-2x-1y+2=0
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Question 199927: There are 21 people in science class. Out of those 3/7 are 8th graders. how many are 8th graders?

Answer:

A. 7

B. 8

C. 9

D. 10

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Question 199926: Nick had 1 3/4 gal of milk. How many pints of milk does Nick have?

Answer:

A. 12

B. 14

C. 16

D. 18

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Question 199924: 3 friends decide to split the cost of food and rent evenly. They spend a total of $ 542.35 on food and $ 1257.65 on rent. Find the amount each of the 3 friends paid.

Answer:

A. 600

B. 500

C. 550

D. 650

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Question 199934: graph the following equation and identify the y-intercept: y=x+1, it makes me give 3 different answers to plot
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Question 200112: x^2+y^2+2x-4y-4=0 complete square and state the center and the radius or the circle
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Question 200121: -x+4y=-11
2x+4y=-2

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Question 200189: Your dad is 34 years older than your brother. Five years ago, your dad was three times as old as your brother. How old are they now?
What I know already:
x-y = 34
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Question 200258: please help me!! solve this equation
2x+2y=-6
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Question 200166: Hi
A rectangular piece of sheet metal with an area of 800 in^2 is to be bent into a cylindrical length of stovepipe having a volume of 400 in^3. What are the dimensions of the sheet metal?
thanks for the homework help!
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Question 200265: Hi!
A biologist has two brine solutions, one containing 1% salt and another containing 4% salt. How many milliliters of each solution should he mix to obtain 1 L of a solution that contains 2.8% salt?
thanks for the homework help!

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Question 200165: Hi!
Find all solutions of the system of equations. (Round each answer to two decimal places. Enter NONE in any unused answer blanks.)
{xy = 20
2x^2 - y^2 + 4 = 0
thanks!
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Question 200312: Hi!
A man and his daughter manufacture unfinished tables and chairs. Each table requires 2 hours of sawing and 2 hours of assembly. Each chair requires 1 hour of sawing and 3 hours of assembly. The two of them can put in up to 10 hours of sawing and 12 hours of assembly work each day. Find a system of inequalities that describes all possible combinations of tables and chairs that they can make daily. Graph the solution set. (Assume x is the number of tables and y is the number of chairs.)
thanks for the homework help!
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Question 200526: I need to know how to find the anwser to problems like this one. I need step by step instruction on how to solve them.
4x+y=16
4x+y=12
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Question 200525: write an equation of a line that is perpendicular to y= 2x +3
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Question 200525: write an equation of a line that is perpendicular to y= 2x +3
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Question 200447: 48 = 6y
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Question 200558: A 90% antifreeze solution is to be mixed with a 75% solution to make 120L of an 85% solution. How many liters of the 90% solution should be used?
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Question 200624: y=x+4
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Question 200629: Solve by the elimination method
x+2y=17
-x+6y=23
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Question 200628: 8x+9y=-2
-9x+y=69
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Question 200626: y=-3x+7
y=4x-7

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Question 200633: If an object is projected upward with an initial velocity of 48 ft pe second from a height h of 160 ft, then its height t second after it is projected is defined by the equation h= -16t 2 + 48t + 160. How many seconds after it is projected will it hit the ground?
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Question 200634: y=x+4
y=2x-6
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Question 200636: A farmer has 240 meters of fencing and wants to enclose a rectangular area of 3200 square meters. What dimensions should he use?
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Question 200637: A box with no top is to be constructed from a piece of cardboard whose width measures x in. and whose length measures 5 in. more than its width. The box is to be formed by cutting squares that measure 2 in. on each side from the four corners and then folding up the sides. If the volume of the box will be 72 in.3 what are the dimensions of the piece of cardboard?
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Question 200635: The printed matter on a 14 by 16 centimeter page of a book must cover 80 square centimeters. If all margins are to be the same width, how wide should they be?
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Question 200690: Two machines are turned on at 8:00 am If one can produce 45 items each hour and the other can produce 71 items each hour, at what time will they produce a total of 232 items?
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Question 200691: A ball is projected upward from ground level. After t seconds its height in feet is a function defined by f(t)= -16t2 + 48t. After how many seconds will it reach a height of 32 ft?
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Question 200689: Find the domain of the rational function
h(x)= x-80 over x to the 3rd - 2x to the 2nd - 35x

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Question 200813: get the value of x and y
x-y=5
3x+y=3
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Question 200854: The Jurassic Zoo charges $28.00 for each adult admission and $12.00 for each child. The total bill for 254 people from a school trip was $3864.00. How many adults and how many children went to the zoo?
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Question 200985: Please help me solve this equation: 3x+2y=7
5x-2y=1

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Question 200992: please solve 4x-12y=16
8x+4y=24
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Question 201001: solve system of equations by substitution
2y-=13
x=-y+5
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Question 201022: solve using substitution method
3x+7y=0
x=11-6y
Find soultions.
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Question 201006: Solve the system of equations using the elimination method.
2a+3b=-1
3a+5b=-2
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